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Definition of extension : 1. A written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
2. Capacity of a concept or general term to include a greater or smaller number of objects; - correlative of intension.
3. That property of a body by which it occupies a portion of space.
4. The act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion.
5. The operation of stretching a broken bone so as to bring the fragments into the same straight line.
6. The straightening of a limb, in distinction from flexion.

Synonyms:

concomitant, book of facts, wing, purview, flank, supplement, extension service, compass, spread, point of reference, realm, swing, scope, cite, backstage, character reference, lengthiness, length, generation, mention, branch, file name extension, perpetuation, offstage, sphere, propagation, annexe, reference, elongation, ambit, denotation, character, arm, width, extent, telephone extension, indication, university extension, credit, range, fender, long, reference point, computer address, source, extension phone, acknowledgment, distance, filename extension, sweep, reference book, territory, quotation, citation, size, part, reference work, reach, consultation, orbit, address, delay

annex, amalgamation, swelling

attachment, secondary, extra, brother, lieutenant, adornment, accessory, companion, appendage, accompaniment, consort, addition, appendix, addendum, garnish, ornament, second, adjunct, fixture, auxiliary, appurtenance

interminability, abidingness, persistence, maintenance, perseverance, prolongation, continuance, continuation, protraction

fattening, lengthening, amplification, burgeoning, distension, broadening, engorgement, dilation, crescendo, stretching, development, thickening, widening, spreading

enlargement, augmentation, magnification, growth, inflation, increase, elevation, increment, expansion, accrual, multiplication

Usage examples:

• The extension of the electric- car line also deserves notice. - "The Future of Road-making in America", Archer Butler Hulbert.
• Every American will benefit by the extension of social security to cover the hospital costs of their aged parents. - "Complete State of the Union Addresses from 1790 to the Present", Various.
• Miss Winthrop glanced down at the telephone extension on her desk, and her hand darted toward it. - "The Leak", Jacques Futrelle.